Never a fan of Taiwanese or Japanese Coilovers. I'll take either US or European Brands any day like AST, Ohlins, TC Kline, KW, Bilstein, JRZ, Motons, Nitrons etc etc.

My friend is an official distributor of AST if you are interested but prepare 3k

Sounds like you have money to burn
Maybe if you could compare the shocks side by side for performance and build quality you would change your mind,
I can have what i want but i use BC ER for around $1700,00 these are fantastic for anything but a full blown race car, why would you want to spent $4,000 plus for the same thing in anther brand.
Unless you are building a race car and are logging suspension data then your spend will be around the $12-$15.000 for something reasonable.
Don't wast your bucks on over priced US or Euro crap.
At the end of the day it is a road car that you may or may not do the odd track day